Voice biometric systems can be defeated by "wolves"


 The founder of Australian voice biometrics outfit Armorvox, Dr. Clive Summerfield, claims that between 10% and 20% of utterances collected by voice biometric systems are not strong enough identifiers on the individual that spoke them.

Most voice biometric implementations require users to utter a phrase as part of the authentication process. However, a small fraction of the population Dr Summerfield labels as “wolves”, have voice prints that can match many others, while “goats” are those with generic voice prints. 

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Story added 15. March 2012, content source with full text you can find at link above.